/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.logging.log4j.core.pattern;

import org.apache.logging.log4j.core.util.Throwables;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * {@link ThrowablePropertyRendererFactory} implementation where the causal chain will be processed in reverse order.
 */
@NullMarked
final class ThrowableInvertedPropertyRendererFactory extends ThrowablePropertyRendererFactory {

    static final ThrowableInvertedPropertyRendererFactory INSTANCE = new ThrowableInvertedPropertyRendererFactory();

    private ThrowableInvertedPropertyRendererFactory() {
        super(ThrowableInvertedPropertyRendererFactory::extractThrowingMethod);
    }

    @Nullable
    private static StackTraceElement extractThrowingMethod(final Throwable throwable) {
        final Throwable rootThrowable = Throwables.getRootCause(throwable);
        return rootThrowable.getStackTrace()[0];
    }
}
